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James Yate Johnson
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Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography
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Abstract
4280. Johnson, J. Y., [Badische Anilin & Soda Fabrik]. Feb. 19. Pigments.-Red azo colouring-matters, which are produced by combining diazotized 4-chloraniline-5- or 6-sulphonic acid with #-naphthol, are converted into lakes by treating them as described in Specifications No. 25,511, A.D. 1899, No. 2784, A.D. 1900, and No. 20,553, A.D. 1901.
GB190204280D1902-02-191902-02-19The Manufacture and Production of New Azo Colouring Matters and Colour Lakes
ExpiredGB190204280A
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